armstrong



(No Model.) 7 2 Sheets-Sheet 1. G. S. ARMSTRONG.

GONOENTRATOR.

No. 327,915. Patented Oct. 6, 1885.

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(No Model.) 2 Sheets-Sheet 2. G. S. ARMSTRONG.

GONOENTRATOR. No. 327,915. Patented 001;. 6, 1885 GEORGE S. ARMSTRONG, OF DENVER, COLORADO.

CONCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 327,915, dated October 6, 1885.

Application filed Marrh 20, 1885.

precious metals contained in auriferous and argentiferous sand and any other substances, when said metals are found in a free state, from the crude substances with which they are mingled, which said means shall possess the qualities of durability and cheapness.

In the drawings, Figure 1 is a side view of my invention. Fig. 2 is a sectional side view taken vertically through the center. Fig. 3 is a'front view of the same. Fig. 4 is a back view with the door open, showing the ribbed plates. Fig. 5 is a top view of a ribbed plate. Fig. 6 is a side View of awheel, showing a slot by means of which one extremity of a bar or pitman-rod is attached at any desired distance from the center of the same, the other extremity of the bar being attached to the body of the machine.

Similar letters refer to similar parts in the several views.

A is a vertical box with a journal, a, in its center upon each side, by means of which journals the box is mounted upon a suitable frame, 13, the journals working in center boxes, to, said center boxes having a slight horizontal movement within slotted boxes a the movement of the center boxes, a, within the boxes (6 being controlled by adj Listing-bolts a The boxes a are attached to the top of the frame 17, as shown inthe drawings.

To the top of the box A is attached a hopper, 7), within which is the screen 0, which rejects the coarse worthless material thrown into the hopper, allowing the rest to pass through to the bottom of the hopper, which contains an opening through which the screened material passes to the oblique plate d.

e e, &c., are ribbed plates placed obliquely Serial No. 150,533. (No model.)

in the box A and resting upon wooden shelves e said plates 6 being fastened to said shelves and held in place by movable pins or bolts which pass through the forward parts of the plates into the corresponding portions of said shelves, one pin or bolt being sufficient for each plate. Each of the plates 9 has several curved ribs, 6, extendingacross the same. To the top of each of said ribs and at a short distance form its center on each side are attached the extremities of a small straight bar, 6 distinctly shown in Figs. 4 and 5, which assists the ribs 6 in retaining the valuable particles of metal which come in contact with the surface of the plates 6.

f is a screen attached to the bottom of the box A, which receives the material which passes over the ribbed plates and discharges the coarser worthless particles, allowing the rest to pass through into the receptacle 9, in the bottom of which is a shallow recess, g, the object of which is to catch any of the coarser particles of precious metal that may have passed over the ribbed plates e.

h is a discharge-table adjusted vertically by means of the screw q, secured in the frame B, and the hand-wheel q, forming a nut upon said screw. The table h is pivoted on each side of the rear part to a swing, 1), said swing being attached to screw g by the pin or bolt 0, as shown in the drawings. The swing n has an oscillating movement, moving easily upon the pin 1;. By turning the hand-wheel q upon the screw q the rear part of the table h is raised and lowered to give said table a greater or less inclination, as may be desired.

12 is a crank attached to the cog-wheel 1, which meshes with a smaller cog-wheel, r. The cog-wheel a" is attached to a shaft, 0, the shaft turning with the wheel.

To the opposite extremity of the shaft 1' is attached the motor-wheel t, to which is attached one extremity of the bar a at any de sired distance from the center of the wheel 2, this distance being regulated by means of the slot t, Fig. 6, the other extremity of the bar a being attached to the vertical box A, as shown in the drawings.

In operating my invention the material designed to be treated is placed in the hopper 6, coming in contact at once with the screen a.

The machine at the same time is put in motion by the application of power to the crank 10, or by attaching a belt to the wheel 1", said belt being connected with any suitable motor. The wheel 1" being set in motion moves the connecting-wheel1, which in turn moves the wheel t, which, being connected with the bar a at any point not in the center of said wheel, gives the vertical box A an oscillatory movement. The box A, being supported by the journals a, as above described, requires but little power to set it in motion, the journal-boxes a having a slight horizontal movement, as above described. By virtue of said horizontal motion of the box A, in combination with its oscillatory motion, the material placed in the hopper b is either sifted through the screen 0 or discharged from the spout b, the coarse worthless particles alone passing from said spout. Should the material placed in the hopper contain clay, the same may be reduced by the mo tions of the box A and the action of the water to a fluid, so that the particles of precious metal may be separated from the same, as hereinafter described. The water used in operating my machine is run into the hopper by any suitable means; The materialafter passing through the screen 0 is discharged through an opening, 12 in the bottom of the hopper to the oblique plate d, from which it is conducted to the first ribbed plate 6. By Virtue of the peculiar shape and construction of the ribs upon the surface of the plates e, said plates are specially adapted, under the influence of the motions of the machine already described, to catch the coarser particles of precious metal contained in the material passing over them.

Any number of ribbed plates 6 may be used, the object being to have enough of said plates to answer fully the purpose for which they are intended, as aforesaid. After leaving the last ribbed plate e the material, deprived of the coarser particles of precious metal, is discharged upon the screen f in the top of the receptacle 9. A large portion of the coarse worthless material is rejected by the screen f and thrown from the spout 9 upon the discharge-table h and from the machine. The balance of the material passes through the screen f into the receptacle 9. If there are any coarse particles of valuable metal remaining in said material, they are caught in the shallow recess 9' in the bottom of the receptacle 9.

When it is desired to clean up, the ribbed v quick, capacity great, and machines may be built small and light.

The table it is pivoted at its rear end to hangers y, attached to the bottom of the vertical box A, thus giving the table h a movement similar to that imparted to the box A when the machine is in operation.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a concentrator, the combination of a suitable frame provided with the boxes a,with the box A, journal a, boxes a, and mechanism for operating said box A, consisting of gearwheels 1" and r, shaft r crank-wheel t, and pitman-rod u, substantially as described.

2. In a concentrator, the plates e, provided with ribs e, to which are attached the small straight bars 6 as described, in combination with shelves c and box A, substantially as described and shown, and for the purpose set forth.

GEORGE S. ARMSTRONG. In presence of- J. B. WILLSEA, R. W. MODERMOTT, 

